id:A087293 - OEIS Search Results

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a(n)=k such that f(k)=((prime(k)*prime(k+1))^2+1)/2 is prime.

+0
2

2, 3, 6, 14, 27, 30, 35, 37, 44, 55, 101, 106, 118, 127, 137, 140, 154, 172, 184, 233, 248, 256, 260, 289, 383, 389, 425, 461, 463, 485, 500, 503, 513, 552, 584, 610, 617, 630, 642, 696, 706, 714, 737, 746, 819, 884, 926, 952, 964, 978, 1004, 1008, 1019, 1027 (list; graph; listen)

	OFFSET	`0,1`
	COMMENT	`Resulting primes are in A087294.`
	EXAMPLE	`2 is in the sequence because f(2)=((prime(2)prime(3))^2+1)/2=((35)^2+1)/2=113 is prime.`
	CROSSREFS	`Cf. A086893, A087294.` `Sequence in context: A123041 A078557 A005537 this_sequence A106364 A006444 A032047` `Adjacent sequences: A087290 A087291 A087292 this_sequence A087294 A087295 A087296`
	KEYWORD	`nonn`
	AUTHOR	`Ray Chandler (rayjchandler(AT)sbcglobal.net), Aug 31 2003`

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Last modified July 26 23:19 EDT 2008. Contains 142293 sequences.

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